I had form CH. I'm not sure of all the different forms, but I heard that only the first letter of the form matters... Did you get a passage about various stimuli and you had to interpret the graphs and how the factors correlate? If so, then you had the same form as me... I found BS to be easier than usual, but that was only cuz they had the topics that I liked: orgo, genetics, biochem, and not a lot of human physio.